﻿//The MIT License

//Copyright (c) 2009 Lluis Sanchez, Nick Darnell

//Permission is hereby granted, free of charge, to any person obtaining a copy
//of this software and associated documentation files (the "Software"), to deal
//in the Software without restriction, including without limitation the rights
//to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//copies of the Software, and to permit persons to whom the Software is
//furnished to do so, subject to the following conditions:

//The above copyright notice and this permission notice shall be included in
//all copies or substantial portions of the Software.

//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//THE SOFTWARE.

using System;
using System.Reflection.Emit;

namespace Polymorph
{
    /// <summary>
    /// The <see cref="CodeCatch"/> class represents a catch block.
    /// </summary>
    public class CodeCatch : CodeStatement, IExceptionBlock
    {
        private Type m_exceptionType;
        private CodeBlock m_catchBlock;

        /// <summary>
        /// Initializes a new instance of <see cref="CodeCatch"/> with the exception
        /// type to catch.
        /// </summary>
        /// <param name="exceptionType">The exception to catch.</param>
        public CodeCatch(Type exceptionType)
        {
            m_exceptionType = exceptionType;
        }

        /// <summary>
        /// Gets or sets the exception type to catch with the catch statement.
        /// </summary>
        public Type ExceptionType
        {
            get { return m_exceptionType; }
            set { m_exceptionType = value; }
        }

        /// <summary>
        /// Gets or sets the catch block for the catch statement.
        /// </summary>
        public CodeBlock CatchBlock
        {
            get { return m_catchBlock; }
            set { m_catchBlock = value; }
        }

        /// <summary>
        /// Generates the IL code for the catch block.
        /// </summary>
        /// <param name="gen">The IL generator to use.</param>
        public override void Generate(ILGenerator gen)
        {
            gen.BeginCatchBlock(m_exceptionType);
            m_catchBlock.Generate(gen);
        }

        /// <summary>
        /// Prints the code for a catch block in a human readable format.
        /// </summary>
        /// <param name="cw">The code writer to use.</param>
        public override void PrintCode(CodeWriter cw)
        {
            cw.Write("catch(");
            cw.Write(m_exceptionType.Name);
            cw.Write(" ex)");
            cw.EndLine();
            cw.WriteLine("{");
            cw.Indent();
            if (m_catchBlock != null)
            {
                m_catchBlock.PrintCode(cw);
            }
            cw.Unindent();
            cw.BeginLine();
            cw.Write("}");
        }
    }
}